Princeton's WordNet

1. infectious, infective(adj)

   caused by infection or capable of causing infection

   "viruses and other infective agents"; "a carrier remains infective without himself showing signs of the disease"

2. infectious(adj)

   easily spread

   "fear is exceedingly infectious; children catch it from their elders"- Bertrand Russell

3. infectious(adj)

   of or relating to infection

   "infectious hospital"; "infectious disease"

Kernerman English Learner's Dictionary

1. infectious(adjective)ɪnˈfɛk ʃəs

   (of a disease) easily passed from one person to another

   a highly infectious stomach bug

2. infectiousɪnˈfɛk ʃəs

   (of behavior) causing others to do the same

   an infectious laugh

Wiktionary

1. infectious(Adjective)

   Transmitted from one person to another, usually through the air breathed.

2. infectious(Adjective)

   Able to infect others.

   Despite feeling better, the patient is still infectious.

3. infectious(Adjective)

   Spreading quickly from one person to another.

   Her enthusiasm for work can be really infectious.

4. infectious(Adjective)

   Memorable and invoking excitement or interest.

   Pop music is more infectious than elevator music.

Webster Dictionary

1. Infectious(adj)

   having qualities that may infect; communicable or caused by infection; pestilential; epidemic; as, an infectious fever; infectious clothing; infectious air; infectious vices

2. Infectious(adj)

   corrupting, or tending to corrupt or contaminate; vitiating; demoralizing

3. Infectious(adj)

   contaminating with illegality; exposing to seizure and forfeiture

4. Infectious(adj)

   capable of being easily diffused or spread; sympathetic; readily communicated; as, infectious mirth

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